225g cassette, tpu tubes, carbon crankset, and weighing without pedals. The holy trinity of weight saving. Yes, I listed 4 items. My bike is 7.5 without pedals with deeper and wider rims. Ah, a 3d printed carbon saddle weighs 160g and costs 50usd. The cassette is also 50 USD. The carbon crankset is 130-200usd. Tpu tubes are under five bucks each.
Nice bike! The brake rub is a dark art. Ride a bit and re align. After a couple of rides stuff tends to fall into place (assuming you use the brakes, ie elevation).